ListView和TextBox，x:Null

<Window x:Class="WpfApp_Delete.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="350" Width="525"

        xmlns:Custom="clr-namespace:WpfApp_Delete"

        >

    <Window.Resources>

        <Custom:DemoList x:Key="MyList">

            <Custom:Demo Address="黄石" Sex="男" />

            <Custom:Demo Address="铁山" Sex="女"/>

        </Custom:DemoList>

        <Custom:Demo x:Key="MyDemo" Address="黄石" Sex="男" />

    </Window.Resources>

    <Grid DataContext="{StaticResource MyList}">

        <Grid.Resources>

            <!--x:Null的事例-->

            <Style TargetType="Button">

                <Setter Property="Width" Value="200"/>

            </Style>

            <Style TargetType="ListViewItem">

                <Setter Property="HorizontalContentAlignment" Value="Center"/>

            </Style>

        </Grid.Resources>

        <TextBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="textBox1" Text="{Binding ElementName=lvRoot, Path=SelectedItem.Sex}" VerticalAlignment="Top" Width="120" />

        <ListView Name="lvRoot" Height="100" HorizontalAlignment="Left" Margin="10,43,0,0" VerticalAlignment="Top" Width="481" ItemsSource="{Binding}" >

            <ListView.View>

                <GridView>

                    <GridViewColumn DisplayMemberBinding="{Binding Address}" Header="住址" Width="100"/>

                    <GridViewColumn DisplayMemberBinding="{Binding Sex}" Header="性别" Width="100"/>

                </GridView>

            </ListView.View>

        </ListView>

        <!--x:Null的事例-->

        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="35,157,0,0" Name="button1" VerticalAlignment="Top" />

        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="265,157,0,0" Name="button2" Style="{x:Null}" VerticalAlignment="Top" />

    </Grid>

</Window>